Type an address, or pick a saved map, and press Find.
Find the property, then check its line on the photo. The shade is worked out over the whole lot and nothing more, so the line has to be right: the county's record is used when there is one, and you trace the corners yourself when there is not.
USGS lidar over the lot, read in your browser and lined up with the photo, becomes the trees and buildings the shade map uses: every block is drawn from the lowest to the highest height where the laser found something that stops light, tilted so you can look under the crowns. If a tree is gone, or you would rather see the lawn without one, erase it here and the shade is worked out without it: "Whole tree" takes everything in the column, "Branches" peels off the blocks facing you, one layer per stroke (tilt and turn the map to reach a side or the underside). What you erase is kept with the map.
Tap a tree for its numbers: what the model took it for, the heights it stops light between, and how much gets through.
Points: groundunder 2 mpulse went on through (leaves, branches)pulse stopped, 2 m+ (roofs, dense crowns). Yellow line: property. Green: lawn.
The sun is traced over the trees, with the leaves as the weather here puts them. Choose what the colors show (hours of direct sun, daily light, or the shadows at one time) and over which days (the growing season, the part of it before leaf-out, in leaf, or after leaf-fall, or one day). The caption under the buttons says exactly what is on the map. Tap a spot to read it, or draw a box to average an area.
This place is in the transition zone, where both kinds of grass are grown. Which will you grow? It sets the growing season.
Fetching ten years of NASA weather…
A clear sky, so the day views are ceilings; the season view uses NASA's measured clouds. Light from the sun's position and the site's height above sea level; shade from the lidar, trees as the choice above says. Things more than 50 m outside the lot are not in the model.
The climate here says cool-season or warm-season grass. The light through the growing season, point by point, cuts the lawn into its sunny and shady parts, and for each part lists the grasses that will hold it, the least shade-tolerant first, so the sunny part gets the sun-lovers and the shady part only the grass that needs them. Then when to plant.
Waiting for the shade map…